My civic duty

When I returned to work after 8 weeks maternity leave, I received a notice that I had been drawn for jury duty selection. What this meant is that I had to reserve two mornings, one month apart, to go in and be processed for possible jury duty. They try to make it as inconvenient as possible by telling you to call the night before to see if you still have to report the next morning. So, I have to go to the trouble of blocking my patient schedule, which is not only problematic for the patients, but loses money for my office. But then I call, and they tell me I don't have to report. Last night, however, they made it even worse by telling me that I didn't need to report in the morning, but I should call at 10:30 am to see if I should report in the afternoon. Huh? What? That was never part of the bargain! And WTF - why can't you just tell me now if I have to be there in the afternoon? Why don't you know?!
Thankfully, they didn't need me (for the third time), so I'm at work and preparing for my afternoon of patients. I entirely agree that I have a civic duty to serve on a jury if need be, but why can't they get a better system?